Yes I think it might have been,because in her Birth Certificate, it states an "inmate" as present at the birth.
Found this on the 1901 Census, might it be Mary ?
Residents of a house 12 in Money (Kilmore, Armagh)
Show all information
Surname
Forename
Age
Sex
Relation to head
Religion
Creany Mary 50 Female Head of Family R Catholic ?
Creany Elizabeth 40 Female Sister R Catholic
But it would mean she gave birth at a very young age ?